Unit component for a chair backrest

ABSTRACT

The present invention relates to a unit component for a chair backrest. The component has a basic body. The basic body has a through hole, a supporting portion, and at least two connecting arms. The through hole is formed on the basic body. The supporting portion is mounted over the through hole. The at least two connecting arms are mounted at corners of the through hole and are connected with the supporting portion.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a unit component for a chair backrest,especially a unit component mounted on the chair backrest for supportinga human's back.

2. Description of the Prior Arts

For better sitting comfort, manufacturers have done researches anddeveloped a backrest and a cushion of a chair by using various materialsor designing different structures to provide comfortable chairs.

A conventional backrest of a chair is used for supporting a human's backto provide a better support to the seated person, and the conventionalbackrest is made of elastic materials such as fabrics or leathers and isdesigned in a curve shape according to ergonomics. As such, a user canrelax his back when sitting on the chair to lean against theconventional backrest.

However, the conventional backrest is made with a fixed curvature uponmanufacturing. So consumers only can choose a suitable chair from thestandardized chairs according to their statures and body shapes.However, the supporting effect of the backrest of the purchased chairvaries from user to user due to their different statures and bodyshapes. In addition, the conventional backrest is fixed in curvature,and for the best supporting effect, the user has to lean their backentirely on the conventional backrest when sitting on the chair. If thebody of the user is oblique relative to the chair, the users back can'tabut entirely on the conventional backrest, and the supporting effect ofthe conventional backrest is not fully applied on the user's back.

Furthermore, the different portions on the user's back require differentsupporting forces. Yet the conventional backrest made of fabrics orleathers has no obvious variations of supporting forces for differentportions of the user's back, such that the user's back cannot be fullyrelaxed by leaning on the conventional backrest.

To overcome the shortcomings, the present invention provides a unitcomponent for a chair backrest to mitigate or obviate the aforementionedproblems.

SUMMARY OF THE INVENTION

The main objective of the present invention is to provide a unitcomponent for a chair backrest that can be used for supporting a human'sback.

The unit component has a basic body, a through hole, a supportingportion, and at least two connecting arms. The through hole is formedthrough the basic body. The at least two connecting arms are mounted onand protrude forwardly from the basic body respectively at corners ofthe through hole. The supporting portion is connected to the connectingarms to extend out of the basic body.

Other objectives, advantages and novel features of the invention willbecome more apparent from the following detailed description when takenin conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a chair that comprises unit componentsfor a chair backrest in accordance with the present invention;

FIG. 2 is a top view of the unit components for a chair backrest in FIG.1;

FIG. 3 is a top view of a first embodiment of the unit componentsmounted at a specific area of a chair backrest;

FIG. 4 is a perspective view of the unit components for a chair backrestin FIG. 3;

FIG. 5 is a cross sectional view of the unit components for a chairbackrest along line 5-5 in FIG. 3;

FIG. 6 is a top view of the unit components, showing both a secondembodiment and a third embodiment mounted in combination on a chairbackrest; and

FIG. 7 is a perspective view of the unit components for a chair backrestin FIG. 6;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

With reference to FIGS. 1 to 4, a first embodiment of a unit component10 for a chair backrest 40 in accordance with the present invention hasa basic body 11, a through hole 12, four connecting arms 14, and asupporting portion 13. The basic body 11 is a square plate and has acenter, a front side and a rear side. The through hole 12 may berectangular, circular, or in other shapes, is formed through the frontside and the rear side of the basic body 11 at the center of the basicbody 11, and has four corners. With further reference to FIGS. 4 and 5,the connecting arms 14 are mounted on and protrude forwardly from thebasic body 11 respectively at the corners of the through hole 12, andeach one of the connecting arms 14 has a free end extending out of thefront side of the basic body 11.

The supporting portion 13 may be circular, rectangular, or in othershapes, and is connected to the free ends of the connecting arms 14 toextend out of the basic body 11. In addition, multiple unit components10 of the first embodiment of the present invention are connected toeach other to form a specific area of the chair backrest 40. When theunit components 10 are connected to each other, the basic bodies 11 areformed as a main supporting structure of the chair backrest 40. Then,when a user sits on a cushion 50 that is connected to the chair backrest40, the supporting portions 13 of the unit components 10 can be used toprovide a supporting effect to the user's back and the connecting arms14 can be elastically deformed with uniform force to provide comfort tothe user.

With reference to FIG. 6, a second embodiment of a unit component 20 fora chair backrest 40 in accordance with the present invention issubstantially the same as the first embodiment except for the followingfeatures. The unit component 20 has a basic body 21, a through hole 22,two connecting arms 24 and a supporting portion 23. The connecting arms24 are mounted on and protrude forwardly from the basic body 21respectively at two of the corners of the through hole 22, and arealigned with each other in a vertical arrangement.

With reference to FIG. 7, a third embodiment of a unit component 30 fora chair backrest 40 in accordance with the present invention issubstantially the same as the second embodiment except for the followingfeatures. The unit component 30 has a basic body 31, a through hole 32,two connecting arms 34 and a supporting portion 33. The connecting arms34 are mounted on and protrude forwardly from the basic body 31respectively at two of the corners of the through hole 32, and arealigned with each other in a horizontal arrangement.

With reference to FIGS. 1 and 2, the connecting arms 14, 24, 34 of theunit components 10, 20, 30 are formed on the basic bodies 11, 21, 31with different arrangements of positions, and this can enable the unitcomponents 10, 20, 30 to provide different supporting effects to theuser's back. Preferably, the unit components 10 of the first embodimentin the present invention can be connected to each other to form a lowerarea of the chair backrest 40, and the four connecting arms 14 of eachone of the unit components 10 can provide a preferred supporting effectto the user's waist. In addition, the unit components 20, 30 of thesecond and the third embodiments in the present invention can beconnected to each other to form an upper area of the chair backrest 40.When the user's back leans on the upper area of the chair backrest 40,even if the body of the user is in an oblique posture, the supportingportions 23, 33 can still abut the user's back to provide a preferredsupporting effect to the user's back.

Therefore, the chair backrest 40 that is formed by the unit components10, 20, 30 can provide different supporting effects to the user's backby the different arrangements of positions of the connecting arms 14,24, 34 and can provide a preferred abutting support to the user's backeven when the user moves his body. Furthermore, the unit components 10,20, 30 in the present invention can be used to form different kinds ofchair backrests 40, and the user can choose a chair backrest accordingto the user's stature. Additionally, when users with different staturessit and lean on the chair backrest 40, the elastic deformations of theconnecting arms 14, 24, 34 of the unit components 10, 20, 30 also canenable the supporting portions 13, 23, 33 to abut and support the users'backs.

Even though numerous characteristics and advantages of the presentinvention have been set forth in the foregoing description, togetherwith details of the structure and features of the invention, thedisclosure is illustrative only. Changes may be made in the details,especially in matters of shape, size, and arrangement of parts withinthe principles of the invention to the full extent indicated by thebroad general meaning of the terms in which the appended claims areexpressed.

What is claimed is:
 1. A unit component for a chair backrest comprising:a basic body being a square plate and having a center, a front side anda rear side; a through hole formed through the front side and the rearside of the basic body at the center of the basic body and havingmultiple corners; at least two connecting arms mounted on and protrudingforwardly from the basic body respectively at one of the corners of thethrough hole; and a supporting portion connected to the connecting armsto enable the supporting portion to extend out of the basic body.
 2. Theunit component for a chair backrest as claimed in claim 1, wherein theunit component has four connecting arms protruding forwardly from thebasic body respectively at four corners of the through hole, each one ofthe connecting arms has a free end extending out of the front side ofthe basic body, and the supporting portion is connected to the free endsof the connecting arms.
 3. The unit component for a chair backrest asclaimed in claim 1, wherein the unit component has two connecting armsprotruding forwardly from the basic body respectively at two of thecorners of the through hole and aligned with each other in a verticalarrangement.
 4. The unit component for a chair backrest as claimed inclaim 1, wherein the unit component has two connecting arms protrudingforwardly from the basic body respectively at two of the corners of thethrough hole and aligned with each other in a horizontal arrangement. 5.The unit component for a chair backrest as claimed in claim 1, whereinthe through hole is rectangular.
 6. The unit component for a chairbackrest as claimed in claim 2, wherein the through hole is rectangular.7. The unit component for a chair backrest as claimed in claim 3,wherein the through hole is rectangular.
 8. The unit component for achair backrest as claimed in claim 4, wherein the through hole isrectangular.
 9. The unit component for a chair backrest as claimed inclaim 1, wherein the through hole is circular.
 10. The unit componentfor a chair backrest as claimed in claim 2, wherein the through hole iscircular.
 11. The unit component for a chair backrest as claimed inclaim 3, wherein the through hole is circular.
 12. The unit componentfor a chair backrest as claimed in claim 4, wherein the through hole iscircular.
 13. The unit component for a chair backrest as claimed inclaim 1, wherein the supporting portion is circular.
 14. The unitcomponent for a chair backrest as claimed in claim 2, wherein thesupporting portion is circular.
 15. The unit component for a chairbackrest as claimed in claim 3, wherein the supporting portion iscircular.
 16. The unit component for a chair backrest as claimed inclaim 4, wherein the supporting portion is circular.
 17. The unitcomponent for a chair backrest as claimed in claim 1, wherein thesupporting portion is rectangular.
 18. The unit component for a chairbackrest as claimed in claim 2, wherein the supporting portion isrectangular.
 19. The unit component for a chair backrest as claimed inclaim 3, wherein the supporting portion is rectangular.
 20. The unitcomponent for a chair backrest as claimed in claim 4, wherein thesupporting portion is rectangular.